package com.yuan.plugin.sm;

import java.util.Hashtable;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;

import android.graphics.Bitmap;

public class QRCodeHelper {

	/**
	 * 生成二维码
	 * @param url
	 * @param ImgW
	 * @param imgH
	 * @return
	 */
	public Bitmap createQRImage(String url, int ImgW, int imgH){
        try{
            //判断URL合法性
            if (url == null || "".equals(url) || url.length() < 1){
                return null;
            }
            Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            //图像数据转换，使用了矩阵转换
            BitMatrix bitMatrix = new QRCodeWriter().encode(url, BarcodeFormat.QR_CODE, ImgW, imgH, hints);
            int[] pixels = new int[ImgW * imgH];
            //下面这里按照二维码的算法，逐个生成二维码的图片，
            //两个for循环是图片横列扫描的结果
            for (int y = 0; y < imgH; y++){
                for (int x = 0; x < ImgW; x++)
                {
                    if (bitMatrix.get(x, y))
                    {
                        pixels[y * ImgW + x] = 0xff000000;
                    }
                    else
                    {
                        pixels[y * ImgW + x] = 0xffffffff;
                    }
                }
            }
            //生成二维码图片的格式，使用ARGB_8888
            Bitmap bitmap = Bitmap.createBitmap(ImgW, imgH, Bitmap.Config.ARGB_8888);
            bitmap.setPixels(pixels, 0, ImgW, 0, 0, ImgW, imgH);
            return bitmap;
        }
        catch (WriterException e){
            e.printStackTrace();
            return null;
        }
    }
}
